package com.woniuxy.filters;

import com.woniuxy.enums.TokenStatusEnum;
import com.woniuxy.jwt.JWTUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

/**
 * TODO
 *
 * @Description
 * @Author jresm骏
 * @Date 2022/12/9 14:23
 **/
public class JWTGlobalFilter implements GlobalFilter, Ordered {


    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //从请求头获取key为Authorization的值，就是我们的JWT：json web token；
        List<String> authorization = exchange.getRequest().getHeaders().get("Authorization");
        if (authorization != null){
            String token = authorization.get(0);
            //校验token时候有效，如果有效果就放行

            TokenStatusEnum verify = JWTUtils.verify(token);
            if (verify.equals(TokenStatusEnum.TOKEN_SUCCESS)){
                return chain.filter(exchange);//放行
            }else if(verify.equals(TokenStatusEnum.TOKEN_EXPIRE)){
                //如果过期
                exchange.getResponse().setStatusCode(HttpStatus.FORBIDDEN);
                return Mono.error(new ArithmeticException("长时间未操作，请重新登录"));
            }
        }else{

            //说明没有token，判断 时候登录请求

            if ("/auth/login".equals(exchange.getRequest().getPath().toString())) {
                return chain.filter(exchange);//放行
            }else {
                //判断该链接是否需要登录认证或者某个角色！
                exchange.getResponse().setStatusCode(HttpStatus.FORBIDDEN);
                return Mono.error(new ArithmeticException("没有登录，请先登录"));

            }
        }
        return chain.filter(exchange);//放行
    }

    @Override
    public int getOrder() {
        return Ordered.HIGHEST_PRECEDENCE;
    }
}
